Apparatus for eliminating dust and fumes



Feb, 2L 1950 R. WEBSTER ET AL APPARATUS FOR ELIMINATING DUST AND FUMESFiled Jan. 24, 1946 ,,Z"f V1 .cranes or hoists for handling.

.carried thereby to -a point of disposal.

Patented Feb. 21, 1950 APPARATUS FOR ELIMINATING 'DUST AND FUMES .Ronald-Webste13-Evanston, and Daniel Petty,

'Skokie,'Ill., ass'ignors to'llhe. Hydro-Blast Corporation,Chicago,'1ll., a corporation of Illinois Application-January 24,19.46,?Serial.No.2.643g189 4 Claims.

.This invention relates tonmethod 1 of andap- Hpa-ratus foreliminating.dust and fumes. and more particularly tothe-eliminationof .dust andfumes during shake-out of castings in foundries.

Theshaking-out of castings in foundry practice/has longbeen .atroublesome and unpleasant operation,particularly inithecase of largecastings which .cannotzbe handled in. a closed .room and which requirethe -.use of heavy overhead .In castings of this sort,--when the cope isremoved-from the drag a blast of .-hot fumeslrises from thecasting andfrom theexposed molding sand in thee-mold. This blast, in itselfobjectionable, {picks up and carries with itiparticles .of dust such :aslfine, heated iparticles ofysand rand the like from the mold. :The fumesand .dust forming the blast disperse themselves -..over .the -entirefoundry causing an=--uncomfortab1e-and: hazardous condition. for workmenin, the foundryand producing a great. deal :of undesirable .dirt.

eliminating fumes and dust inatoundryshakeout operationin which-the useof. cranes orhoists to handle the casting or the-mold .partsis notinterfered with.

Still another object .-is to provide apparatus fOr eliminating fumes anddust from a space confined on two sideseand .open at itstop-and-ends sothateasy access maybehad .tormater-ialsin the space.

Afurther object-.isto provide a method of and apparatus :for eliminatingfumes and dust in which the fumes, dust and surrounding air areentrained by high veIQcity Wa-ter jets and are Preferably thearrangement is such-Ithatspaced water jets form in effect an aircurtainto confine and carry away the dust and fumes.

The above and other objects and advantages ioftthe invention will bemore readily' apparent .lfrom: the following description when read: in*connection with the accompanying drawings, in

which- "Figure '1 is ""a diagrammatic *prospective "view of one form ofapparatus embodying the invention for use in foundry shake-outoperations;

Figure 2 is a diagrammatic end section of the apparatus; and

Figure 3 is a diagrammatic transverse sectional view through the jetsindicating the direction of air movement.

The apparatus, as shown, is adapted to be used size are to be removedfrom "molds.

' sprays.

on :a foundry. floor or the like .in .thatJpOrti n of the foundry wherecastings of- .a relatively large .--As shown, the apparatus com-prises apair :of spaced'vertical walls It and II which may be of any "desiredlengthand height to, provide the necessaryspace to accommodate thecastings and molds. "AS

shown, thewall l l.is slightly shorter vertically than the wall til-forapurpose to appear later.

The floor area'between the -walls is preferably formed by an opengrating l2 through which sand shaken from the molds'ma fall'into a'pitl3.

Thesand mayzberemoved from the ,pit "in any desiredimanner as, forexample, by conventional conveyor mechanism, not shown.

The wall I t carries -at its upper portion a-series -of nozzles Msupplied with water under-high pressure on the'order of. approximatelyone-thou- :sand to fifteenrhundred pounds; pertsquare. inch from aheader I5. The nozzles -|4 --are-spaced horizontally along the upperedgeofthe wall 40 'andare arranged to-direct horizontal jets-at anextremely high velocityv across thetop of thespace and .over theupper'edgewof the wall H. :The

When water is" discharging throughthe-noz- 12185, the jets willproduce avortical flow 'of' the "surrounding air inwardly toward the x-jets and'along .in the direction ofjet travel. .For good results the jetsshould-be parallelrand spaced sufliciently far-apart so thatithey willnot. interfere with each other while-being close enough-so is from. 20to 30:inches. This condition'is-indithatthezfiowsoverlap to-provide -asubstantially continuous :air curtain.

in: operation it "has been .found :that dust :and

' fumes are drawnfintofthe Ljets'by' the vortical 'air circulation andare carried by the-jets away" from the shake-out space. During thisoperation the "dust and fumes are wetted out or absorbed ':"by

the water so that the area around'the shake-out space is kept clean andfree from fumes at all times.

The Water of the jets and material entrained thereby is collected by abaffle ll spaced back of the wall H and extending above the top of thewall, as shown. Preferably, the upper edge of the baflie I! is curvedforward so that the jets will strike it at a fiat angle to minimizesplashing. The water from the jets and entrained air,

dust and fumes will be, directed downward eous material may flow. Thewater may fiow through a screen or grating l9 forming the floor underthe bafiie and be conducted awayto waste or for reuse.

The wall II effectively prevents direct return of air or gaseousmaterial flowing through the space I8 to the shake-out space. In orderto A conduct such air and gaseous material away, a

back wall 21 is provided spaced back of the baffle I! to form a passage22 through which the air,

fumes and the like may flow. The passage 22 maydischarge into the openfoundry space or may be connected to discharge out-of-doors, if"

desired. It has been found that in many cases discharge of this air intothe foundry space is not objectionable since the dust and a largeportion' of the fumes coming from the casting and the mold will becarried away with the water and will not rise through the passage 22.

In the installation illustrated, relatively large castings and molds areadapted to be handled. For this purposa'an overhead track 23 is providedon which a hoist 24 may slide. The hoist 24 operates a chain 25 adaptedto be connected 'to-a casting, a mold or the like to raise it andmov'e'it horizontally into and out of the space.

As shown in Figure 2, the chain 25 is connected through'a conventionalhook and bail mechanism to the cope 26 of a mold. The cope is shownresting on a drag 21 to form a complete mold in which the castingis'poured.

With the present construction, it .will be seen j that the chain 25 mayextend down into the shake-out space so thatthe hoist'mechanism can beutilized toraise the cope from the drag without interfering with theaction of the jets l6. Since the hoist maybe controlled from a remotepoint, it is not necessary for any workman to enter the shake-out spaceduring a shake-out operation so that the entire shake-out operation canbe'performed with a minimum of labor and with no discomfort. Wehavefound that operation of the jets will effectively entrain substantiallyall of the dust and fumes created during the shake-out and willeffectively remove such dust and fumes from the shake-out space andprevent them from spreading throughout the foundry space. It will benoted that since air "entrained by the jets is conducted away from theshake-out space a constant flow of air into the space from the open endsthereof occurs so that there is no tendency for the dust or fumes to.diffuse horizontally through the foundry.

While the invention has been illustrated and to be a definition of thescope of the invention,

.reference being had for this purpose to the appended claims.

of the other wall..

2. Apparatus for eliminating dust and fumes during shake-out of castingscomprising a pair of spaced parallel vertical walls defining a spacehaving an open top, a series of nozzles carried by the top portion ofone wall and spaced along the top edge of the wall to direct high'velocity water jets substantially in *a horizontal plane over the spaceand over the other wall, and a baffle spaced back of and extending abovethe [other wall to collect the water and material entrained thereby andmeans providing a free outlet from the'space between the baflie and theother wall for air entrained 'by'the'jets.

3. Apparatus for eliminating dust and fumes during shake-out of castingscomprising a pair of spaced parallel vertical walls defining a spacehaving an open top, a series of nozzles carried by the top portion ofone wall and spaced along the top edge of the wall to direct highvelocity water jets substantially in'fa horizontal plane over the spaceand over the other wall, and a baffle spaced back of and extending abovethe other wall to collect the water and material entrained thereby, thebaffle being formed to "provide an outlet for the water and entraindairand other material remote from the space whereby'it is prevented fromreturning directly to the space.

4. Apparatus for eliminating dust andfumes during shake-out ofcastings'comprising a pair of spaced parallel vertical walls defining aspace having an open top, a series of nozzles carried by the top portionof one wall and spaced along the top edge of the wall to direct highvelocity water jets substantially in a horizontal plane over the spaceand over'thel other wall, a baffle spaced back of andextending above theother wall to collect the water and material entrained thereby and avertically extending back "wall spaced back of the baffle, the bafflebeing formed to provide communication between the spaces in back and infront of it to form passages for conducting away air and gas'entrainedby the jets.

RONALD WEBSTER. DANIEL PETTY.

REFERENCES CITED 7 The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Kleucker Aug. 3,

